Only 3% of bird species have penises.
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Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
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Honeypot ants are a unique insect that use their own bodies as living storage pots of honey.
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In 2011, a male tiger in India adopted a litter of orphaned cubs, taking on the role of ‘mother’. Wildlife officials say such behavior had never been observed before.
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There's a lizard known as the 'Jesus Lizard' that can run across water.
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